Chk1
Chk1 (checkpoint kinase 1) mediates the DNA damage response and normal cell-cycle regulation through checkpoint activation, cell-cycle arrest, DNA repair, and cell death control[1]. Mechanistically, Chk1 functions as a key transducer in genome-integrity checkpoints, especially within ATR-linked responses to stalled replication and genotoxic stress[2][3]. In cancer research, this role makes Chk1 relevant to replication stress, BRCA wild-type ovarian cancer models, and studies combining checkpoint inhibition with DNA-damaging therapy[4][5]. Compared with Chk2, Chk1 shows distinct activation biology and experimentally separable checkpoint functions, while Chk1-S acts as an endogenous splice-variant inhibitor that regulates Chk1-dependent checkpoints[2][6]. For experimental applications, Chk1 inhibitors such as prexasertib/LY2606368 induce replication catastrophe and have been tested in tumor models and recurrent high-grade serous ovarian cancer[7][8].
References:
- [1]. Patil M, et al. Checkpoint kinase 1 in DNA damage response and cell cycle regulation. Cell Mol Life Sci. 2013 Nov;70(21):4009-21. [Content Brief]
- [2]. Bartek J, et al. Chk1 and Chk2 kinases in checkpoint control and cancer. Cancer Cell. 2003 May;3(5):421-9. [Content Brief]
- [3]. Dai Y, et al. New insights into checkpoint kinase 1 in the DNA damage response signaling network. Clin Cancer Res. 2010 Jan 15;16(2):376-83. [Content Brief]
- [4]. Rabezanahary H, et al. Live virus neutralizing antibodies against pre and post Omicron strains in food and retail workers in Québec, Canada. Heliyon. 2024 May 21;10(10):e31026. [Content Brief]
- [5]. Nair J, et al. Resistance to the CHK1 inhibitor prexasertib involves functionally distinct CHK1 activities in BRCA wild-type ovarian cancer. Oncogene. 2020 Aug;39(33):5520-5535. [Content Brief]
- [6]. Pabla N, et al. Checkpoint kinase 1 (Chk1)-short is a splice variant and endogenous inhibitor of Chk1 that regulates cell cycle and DNA damage checkpoints. Proc Natl Acad Sci U S A. 2012 Jan 3;109(1):197-202. [Content Brief]
- [7]. King C, et al. LY2606368 Causes Replication Catastrophe and Antitumor Effects through CHK1-Dependent Mechanisms. Mol Cancer Ther. 2015 Sep;14(9):2004-13. [Content Brief]
- [8]. Lee JM, et al. Prexasertib, a cell cycle checkpoint kinase 1 and 2 inhibitor, in BRCA wild-type recurrent high-grade serous ovarian cancer: a first-in-class proof-of-concept phase 2 study. Lancet Oncol. 2018 Feb;19(2):207-215. [Content Brief]
All Product Categories
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Chk1 Related Products (71)
Related Products (71)
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Recombinant Proteins (2)
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Antibodies (3)
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CX-5461
0 ImagesCX-5461 is a selective, orally active RNA polymerase I inhibitor. CX-5461 disrupts the formation of the SL1-rDNA complex, thereby blocking the transcription initiation of ribosomal RNA without altering the activity of RNA polymerase II, DNA replication, or protein translation processes. CX-5461 upregulates the expression of p21, MDM2, Sestrin1/2, and phosphorylated AMPKα, and reduces the level of phosphorylated Akt. CX-5461 induces G2/G2/M cell cycle arrest, Autophagy, Apoptosis, and cellular senescence, and activates CHK1, CHK2, and RPA. CX-5461 can be used in research related to osteosarcoma, cervical cancer, hematologic malignancies, high-grade serous ovarian cancer, and solid tumors.
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Prexasertib
0 ImagesSynonyms: LY2606368Prexasertib (LY2606368) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib shows potent anti-tumor activity.
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AZD-7762
0 ImagesAZD-7762 is a potent ATP-competitive checkpoint kinase (Chk) inhibitor in with an IC50 of 5 nM for Chk1.
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CX-5461 dihydrochloride
0 ImagesCat. No.: HY-13323APurity: 99.41%CX-5461 dihydrochloride is a selective, orally active RNA polymerase I inhibitor. CX-5461 dihydrochloride disrupts the formation of the SL1-rDNA complex, thereby blocking the transcription initiation of ribosomal RNA without altering the activity of RNA polymerase II, DNA replication, or protein translation processes. CX-5461 dihydrochloride upregulates the expression of p21, MDM2, Sestrin1/2, and phosphorylated AMPKα, and reduces the level of phosphorylated Akt. CX-5461 dihydrochloride induces G2/G2/M cell cycle arrest, Autophagy, Apoptosis, and cellular senescence, and activates CHK1, CHK2, and RPA. CX-5461 dihydrochloride can be used in research related to osteosarcoma, cervical cancer, hematologic malignancies, high-grade serous ovarian cancer, and solid tumors.
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Abd110
0 ImagesAbd110 is a selective ATR PROTAC degrader. Abd110 recruits Cereblon to induce the proteasomal degradation of ATR, and reduces the levels of phosphorylated ATR and downstream phosphorylated CHK1. Abd110 can be used for research on pancreatic cancer and cervical cancer.
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Alnodesertib
0 ImagesSynonyms: ART0380ART0380 is a potent, selective and orally active ATR kinase inhibitor. ART0380 potently inhibits human ATR-ATRIP complex with an IC50 of 51.7 nM. ART0380 binds the ATP pocket of the ATR-ATRIP complex, blocks ATR-dependent Chk1 serine 345 phosphorylation, and induces cell cycle disorder and DNA damage. ART0380 demonstrates potent and selective antitumor activity in preclinical models with varying types of ataxia-telangiectasia mutated (ATM) gene aberrancy. ART0380 can be used for the research of cancer, such as colorectal cancer and prostate cancer.
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PF 477736
0 ImagesSynonyms: PF 00477736PF 477736 (PF 00477736) is a potent, selective and ATP-competitive inhibitor of Chk1, with a Ki of 0.49 nM, it is also a Chk2 inhibitor, with a Ki of 47 nM. PF 477736 shows <100-fold selectivity for Chk1 over VEGFR2, Fms, Yes, Aurora-A, FGFR3, Flt3, and Ret (IC50=8 (Ki), 10, 14, 23, 23, 25, and 39 nM, respectively). PF 477736 can enhance Gemcitabine antitumor activity in vitro and in vivo.
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Prexasertib dihydrochloride
0 ImagesSynonyms: LY2606368 dihydrochloridePrexasertib dihydrochloride (LY2606368 dihydrochloride) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib dihydrochloride inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib dihydrochloride causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dihydrochloride shows potent anti-tumor activity.
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PD 407824
0 ImagesPD 407824 is a checkpoint kinase Chk1 and WEE1 inhibitor with IC50s of 47 and 97 nM, respectively. PD 407824 is a chemical BMP sensitizer and increases the sensitivity of cells to sub-threshold amounts of BMP4.
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SB-218078
0 ImagesSB-218078 is a potent, selective, ATP-competitive and cell-permeable checkpoint kinase 1 (Chk1) inhibitor that inhibits Chk1 phosphorylation of cdc25C with an IC50 of 15 nM. SB-218078 is less potently inhibits Cdc2 (IC50 of 250 nM) and PKC (IC50 of 1000 nM). SB-218078 causes apoptosis by DNA damage and cell cycle arrest.
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Prexasertib dimesylate
0 ImagesSynonyms: LY2606368 dimesylatePrexasertib dimesylate (LY2606368 dimesylate) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib dimesylate inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib dimesylate causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dimesylate shows potent anti-tumor activity.
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SAR-020106
0 ImagesSAR-020106 is an ATP-competitive, potent, and selective CHK1 inhibitor with an IC50 of 13.3 nM for human CHK1. SAR-020106 shows excellent selectivity over CHK2. SAR-020106 significantly enhances the cell killing of Gemcitabine and SN38 by 3- to 29-fold in several colon tumor lines and in a p53-dependent fashion. SAR-020106 can enhance antitumor activity with selected anticancer agents.
